When mandibular permanent central incisors erupt lingually to primary incisors, the primary incisors should?

When mandibular permanent central incisors erupt lingually to the primary incisors, it indicates that the permanent teeth are emerging and often serve as a guideline for managing the primary teeth. The correct choice emphasizes that the primary incisors should be evaluated for extraction based on their mobility and root development.

By the age of 7 ½ to 8 ½, primary incisors that are firm with fully developed roots may still be retained if there is no unusual mobility. However, if they show signs of being loose by this age, they would typically be considered for extraction. This approach balances the need to preserve primary teeth until they are naturally ready to be shed while allowing for timely intervention when the permanent teeth are ready to erupt.

This management is important to prevent any potential malocclusion or alignment issues that can arise if the primary teeth do not shed appropriately, particularly when permanent teeth are already present. The timing helps ensure that the eruption sequence and alignment of the permanent incisors occur as naturally as possible, promoting optimal dental development.